Technical Reference
OPEN824RL / RLW ADSL / VoIP Routers
92
Adding A Virtual Server
Because NAT can act as a “natural” Internet firewall, your router protects your network from being accessed
by outside users when using NAT, as all incoming connection attempts will point to your router unless you
specifically create Virtual Server entries to forward those ports to a computer on your network.
When your router needs to allow outside users to access internal servers, e.g. a web server, FTP server,
Email server or game server, the router can act as a “virtual server”. You can set up a local server with a
specific port number for the service to use, e.g. web/HTTP (port 80), FTP (port 21), Telnet (port 23), SMTP
(port 25), or POP3 (port 110). When an incoming access request to the router for a specified port is received,
it will be forwarded to the corresponding internal server.
To Add A Virtual Server:
From the
Virtual Server
screen,
Click the
Add Virtual Server
link.
The following appears:
The following table lists the
Virtual Server Entry
screen fields and their definitions:
Field Description
Time Schedule
A self-defined time period to enable your virtual server. You may specify a time schedule
or
Always On
for the usage of this Virtual Server Entry.
Application
User-defined description to identify this entry or click
to select existing
predefined rules.
:
20 predefined rules are available. Highlight the radio button to select the
rule,
Application, Protocol
and
External/Redirect Ports
will be filled after the selection.
Protocol
This is the supported protocol for the virtual server. In addition to specifying the port
number to be used, you will also need to specify the protocol used. The protocol used is
determined by the particular application. Most applications will use TCP or UDP.
External Port
The Port number on the Remote / WAN side used when accessing the virtual server.
Redirect Port
The Port number used by the local server in the LAN network.